<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
        /* div{
            width:200px;
            height:200px;
            background-color: blue;
        } */
    </style>
    <link rel="stylesheet" href="./outer.css">
</head>
<body>
    <!-- <div style="width:100px;height:100px;background-color:red;"> -->
    </div>
    <div></div>
</body>
</html>